Cobourg Primary School in Camberwell took up Southwark council’s Fizz Free February challenge.
Throughout the month Southwark council encouraged residents to go fizz free and ditch fizzy drinks for 28 days.
As part of the task pupils looked at how many sugar lumps are in a can of fizzy drink.
Children also discussed the benefits of cutting out fizzy drinks. Karen McBride, Headteacher of Cobourg Primary School, said: “As soon as I heard about Fizz Free February I knew our school should take part.”